For your unique and costly timepieces collection, a prime candidate: fluid-filled display, gravitational gearing, the Ressence Type 3 goes for extreme watch minimalism via extreme engineering. The refractive properties of the liquid in the dome make the dial appear to be sitting right on the surface of the crystal. Notably absent is a crown: nothing to push, pull or twirl, adjustment is driven by rotation of the watch itself via the gravitation-responsive gearing system. Coming soon. €23,000 (about $29,500).
Via Cool Hunting